• Anencephaly
  Anencephaly

  A malformation of the nervous system caused by failure of the anterior neuropore to close. Infants are born with intact spinal cords, cerebellums, and brainstems, but lack for...<br/>Year introduced: 1979
  MeSH
• Sarcoma, Ewing
  Sarcoma, Ewing

  A malignant tumor of the bone which always arises in the medullary tissue, occurring more often in cylindrical bones. The tumor occurs usually before the age of 20, about twic...<br/>Year introduced: 2012 (1963)
  MeSH

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